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    <h1>letter-spacing</h1>
    <div style="letter-spacing: normal;">
        <h3> word-spacing: normal —— 规定字符间没有额外的空间</h3>
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
    </div>
    <div style="letter-spacing: length;">
        <h3> word-spacing: length —— 定义字符间的固定空间。</h3>
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
        This is some text. This is some text.           This is some text.
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